EP0628721A1 - Radialkolbenpumpe - Google Patents
Radialkolbenpumpe Download PDFInfo
- Publication number
- EP0628721A1 EP0628721A1 EP94201695A EP94201695A EP0628721A1 EP 0628721 A1 EP0628721 A1 EP 0628721A1 EP 94201695 A EP94201695 A EP 94201695A EP 94201695 A EP94201695 A EP 94201695A EP 0628721 A1 EP0628721 A1 EP 0628721A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circumferential
- passage
- pressure
- radial
- cylinders
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0452—Distribution members, e.g. valves
Definitions
- the invention relates to a radial piston pump of the type, in which an excentric rotor is adapted to cause the pistons to perform a reciprocating movement within radial cylinders in a pump body, said cylinders being, on one hand, via a lateral suction opening, connected to a liquid reservoir and having their radial outer ends each connected - through a connecting opening that accommodates a pressure valve - to a circumferentially located pressure passage, the pressure valves being pressed on seats within the respective connecting openings by means of at least one common resilient ring member that is located within the circumferential passage under tangential pre-tension, an annular wall portion surrounding the pump body to overlie and cover said circumferential pressure passage in said valve body.
- annular wall portion surrounding the pump body is intended to close the circumferential pressure passage at the outer circumference thereof.
- the tightness of the circumferential passage as a pressure passage is completely determined by sealing rings provided in circumferential grooves on either side of the circumferential pressure passage.
- the invention aims at providing an improved pump of the above type, which is suitable for higher pressures (up to 1000 bar) and which is of a compact and light-weight construction, which is of particular importance for use in hydraulically operated tools.
- this aim is achieved in that the circumferential pressure passage is outwardly sealed by an annular member of plastics material and of a substantially trapezium-shaped cross-section, the longer parallel side of the latter facing radially inwardly and comprising a circumferential groove for receiving the resilient ring member, said annular member being adapted to be introduced radially inwardly into said circumferential pressure passage.
- the annular member of plastics material To enable the annular member of plastics material to be placed into the circumferential pressure passage in a radial inward direction, the annular member will, at first, have to be expanded and placed in position on the circumferential outer surface of the pump body from an end of the latter, after which the annular member is permitted to contract to its original (untensioned) diameter and width and thereby engage into the circumferential pressure passage. Due to the trapezium-shaped cross-section of the annular member of plastics material the latter will tend to slightly bulge convexly outwardly beyond the circumferential outer surface of the pump body.
- annular wall portion will cause the annular member of plastics material to return to a flat shape (as seen in the axial direction), due to which the annular member will be pressed with its inwardly facing base of the trapezium firmly against the sidewalls of the circumferential passage.
- the pressure of the annular member of plastics material against the sidewalls of the circumferential pressure passage will be further increased by the pressure prevailing within the inner circumferential groove of the annular member, said pressure tending to bend the lateral wall portions on either side of said groove axially outwardly.
- the bottom of the circumferential passage is, at a location between two adjacent cylinders, connected to a passage that extends radially inwardly and is, in turn, connected to an axial passage that leads to a pressure connection.
- the annular pump body 1 is surrounded by an annular wall member 2 and has a number of radially directed pumping cylinders 3, in which pistons 4 are mounted for a reciprocating movement.
- the pump body 1 confines a central space 5, into which the radial inner ends project and which also accommodates the excentric part 8 of the rotor 7; the radial inner piston ends broaden into heads 6.
- One end (i.e. the left end as seen in fig. 1) of the central space 5 (fig. 3) is closed by a cover 10 and at a distance from the latter within the pump body 1 ball bearing 11 and 12 are provided, in which the centric portion 9, 9a of the rotor 7 is journalled.
- a connecting shaft made e.g. of a suitable artificial resin, one end of which non-rotatably engages a central bore 14 in the centrical portion 9 of the rotor 7 and the other end of which non-rotatably engages the drive shaft 15 of the pump engine (electric motor) 16.
- the space between the pump body 1 and the housing of the electric motor 16 is radially outwardly confined by a shell 17, which is an extension of the annular wall member 2 and constitutes the outer wall of a reservoir 18 for the liquid to be pumped.
- Liquid may flow from the reservoir 18 through a filter 19 into a suction passage 30 and through suction openings 20 into each of the cylinders 3; the suction passage 30 is constituted by a circumferential groove of a relatively large depth.
- the radial outer ends of the cylinders 3 merge into a circumferential passage 21 that is provided in the outer wall of the pump body 1.
- the connecting openings between the cylinders 3 and the circumferential passage 21 are broadened into chambers 22 for disc-shaped pressure valves 23.
- the pressure valves 23 are pressed on their seats by means of a common resilient closure element, that is received within the circumferential passage 21 and is constituted by a tangentially pre-stressed O-ring 24; the tangential pre-tension of the ring 24 produces a radially inwardly directed closing force on each of the pressure valves 23.
- the circumferential passage 21 is radially outwardly closed by an annular member 31 of plastics material, having at its circumferential inner surface a groove for receiving the O-ring 24; a radially directed connecting passage 28 (fig. 2), which may be selected rather arbitrarily, connects the circumferential passage 21 to a connection 29 for a pressure line that is provided on the end wall of the pump body 1.
- the annular member 31 of plastics material has a trapezium-shaped cross-section, the longer parallel side of which faces radially inwardly. This shape contributes to a very reliable sealing of the annular member relative to the two sidewalls of the circumferential passage, thereby enabling pumping pressures up to 1000 bar.
- Another radial branch of the circumferential pressure passage 21 is indicated at 32; it connects the circumferential passage to the space 5 and intersects an axial bore for a relief valve-control member 33 (vide fig. 4).
- the connecting opening between the pasage 32 and the circumferential passage 21 is, in a manner similar to the connecting opening of the cylinders 3, broadened to a chamber, in which a relief valve 34 is received, the lattter being also pressed on its seat by means of the O-ring 24.
- the relief valve 34 is provided with a radially inwardly extending short stem 34a, that cooperates with a conical pressure surface 33a of the control member 33.
- a similar branch could lead to an overload valve within the reservoir 18 via an axial passage connected to it.
- the effective outer circumferential portion of the excentric rotor part 8 is formed by a slide bearing ring 25 mounted on said rotor part. While the rotor 7 is rotating the slide bearing ring 25 will remain stationary relative to the excentric rotor part 8, so that it will merely preform a translational movement relative to the pump body 1.
- the pistons have their radial inner ends 6 engaging the ring 25 and are caused by the rotating rotor 7 to reciprocate within the respective cylinders.
- liquid e.g. hydraulic fluid
- An axially directed ring portion 26a of the coupling ring 26 engages the outwardly facing end faces of the heads 6 and thereby keeps said heads in contact with the ring 25 of the excentric rotor part 8.
- An annular disc portion 26b is connected with the ring portion 26a and is positioned in a plane at right angles to the pump axis; this annular disc portion 26b is loosely positioned between the right-and end face (as seen in the drawing) of the slide bearing ring 25 and the opposite end face 27 of the pump body 1 or a filling ring 27a lying flush therewith respectively.
- the coupling ring 26, which may be formed of a suitable artificial resin, is coaxially positioned relative to the excentric rotor part 8 and is performing, in operation, a translational movement together with the slide bearing ring 25 relative to the stationary pump body 1.
- the coupling ring 26 could also be mounted on the opposite side of the bearing 25. In that case the annular disc portion 26b would become loosely positioned between the left end surface of the slide bearing ring 25 and the inner side of the cover 10.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Compressor (AREA)
- Details Of Reciprocating Pumps (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL9301010A NL9301010A (nl) | 1993-06-11 | 1993-06-11 | Radiale-plunjerpomp. |
NL9301010 | 1993-06-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0628721A1 true EP0628721A1 (de) | 1994-12-14 |
EP0628721B1 EP0628721B1 (de) | 1998-09-02 |
Family
ID=19862524
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94201695A Expired - Lifetime EP0628721B1 (de) | 1993-06-11 | 1994-06-13 | Radialkolbenpumpe |
Country Status (9)
Country | Link |
---|---|
US (1) | US5647729A (de) |
EP (1) | EP0628721B1 (de) |
JP (1) | JPH08500172A (de) |
KR (1) | KR950703123A (de) |
AT (1) | ATE170597T1 (de) |
DE (1) | DE69412910T2 (de) |
FI (1) | FI950595A (de) |
NL (1) | NL9301010A (de) |
WO (1) | WO1994029592A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0690230B1 (de) * | 1994-06-30 | 1999-03-10 | Applied Power Inc. | Pumpeneinheit |
WO2005021965A1 (de) * | 2003-08-26 | 2005-03-10 | Siemens Aktiengesellschaft | Radialkolbenpumpe |
GB2414523A (en) * | 2004-05-28 | 2005-11-30 | Stanadyne Corp | Radial piston pump with eccentrically driven rolling actuation ring |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19729789A1 (de) * | 1997-07-11 | 1999-01-14 | Bosch Gmbh Robert | Radialkolbenpumpe zur Kraftstoffhochdruckversorgung |
WO2003091571A1 (en) * | 2002-04-26 | 2003-11-06 | Rousset Patrick W | Circumferential piston machines |
US6916158B2 (en) * | 2003-04-30 | 2005-07-12 | Actuant Corporation | Radial piston pump |
TWI274105B (en) * | 2005-01-20 | 2007-02-21 | Hitachi Ltd | Portable vacuum pump and automatic urination treatment apparatus using thereof |
US9435099B2 (en) * | 2012-11-16 | 2016-09-06 | Oldcastle Precast, Inc. | Locking subgrade vault |
US10240316B2 (en) | 2012-11-16 | 2019-03-26 | Oldcastle Precast, Inc. | Locking subgrade vault |
US11066803B2 (en) | 2012-11-16 | 2021-07-20 | Oldcastle Infrastructure, Inc. | Locking subgrade vault |
RU173533U1 (ru) * | 2016-12-06 | 2017-08-30 | Общество с ограниченной ответственностью "ПРОМГАЗ-ТЕХНОЛОГИЙ" | Радиально-поршневой насос с прижимом поршней |
RU2646519C1 (ru) * | 2016-12-06 | 2018-03-05 | Общество с ограниченной ответственностью "ПРОМГАЗ-ТЕХНОЛОГИЙ" | Радиально-поршневой насос с соединительным кольцом |
CN107084105B (zh) * | 2017-06-28 | 2020-01-07 | 中国重汽集团重庆燃油喷射系统有限公司 | 转子泵 |
CN109083821A (zh) * | 2018-07-23 | 2018-12-25 | 江苏大学 | 一种曲轴连杆式风能吸功泵 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1051603A (de) * | 1900-01-01 | |||
GB309745A (en) * | 1928-04-26 | 1929-04-18 | Stanley Burrows | An improved pump |
DE1453663A1 (de) * | 1963-02-16 | 1969-03-13 | Teves Gmbh Alfred | Radialkolbenpumpe |
CH513334A (de) * | 1969-12-05 | 1971-09-30 | Stenberg Flygt Ab | Als Pumpe oder Kompressor verwendbare Kolbenmaschine |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3701857A1 (de) * | 1987-01-23 | 1988-08-04 | Teves Gmbh Alfred | Radialkolbenpumpe |
US5382140A (en) * | 1993-02-11 | 1995-01-17 | Elasis Sistema Ricerca Fiat Nel Mezzogiorno | Radial-piston pump |
NL9301011A (nl) * | 1993-06-11 | 1995-01-02 | Applied Power Inc | Radiale-plunjerpomp. |
-
1993
- 1993-06-11 NL NL9301010A patent/NL9301010A/nl not_active Application Discontinuation
-
1994
- 1994-06-13 WO PCT/NL1994/000141 patent/WO1994029592A1/en active Application Filing
- 1994-06-13 KR KR1019950700532A patent/KR950703123A/ko not_active Application Discontinuation
- 1994-06-13 DE DE69412910T patent/DE69412910T2/de not_active Expired - Lifetime
- 1994-06-13 US US08/381,827 patent/US5647729A/en not_active Expired - Lifetime
- 1994-06-13 EP EP94201695A patent/EP0628721B1/de not_active Expired - Lifetime
- 1994-06-13 JP JP7501617A patent/JPH08500172A/ja active Pending
- 1994-06-13 AT AT94201695T patent/ATE170597T1/de not_active IP Right Cessation
-
1995
- 1995-02-10 FI FI950595A patent/FI950595A/fi unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1051603A (de) * | 1900-01-01 | |||
GB309745A (en) * | 1928-04-26 | 1929-04-18 | Stanley Burrows | An improved pump |
DE1453663A1 (de) * | 1963-02-16 | 1969-03-13 | Teves Gmbh Alfred | Radialkolbenpumpe |
CH513334A (de) * | 1969-12-05 | 1971-09-30 | Stenberg Flygt Ab | Als Pumpe oder Kompressor verwendbare Kolbenmaschine |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0690230B1 (de) * | 1994-06-30 | 1999-03-10 | Applied Power Inc. | Pumpeneinheit |
WO2005021965A1 (de) * | 2003-08-26 | 2005-03-10 | Siemens Aktiengesellschaft | Radialkolbenpumpe |
GB2414523A (en) * | 2004-05-28 | 2005-11-30 | Stanadyne Corp | Radial piston pump with eccentrically driven rolling actuation ring |
GB2414523B (en) * | 2004-05-28 | 2009-05-06 | Stanadyne Corp | Radial piston pump with eccentrically driven rolling actuation ring |
US7950905B2 (en) | 2004-05-28 | 2011-05-31 | Stanadyne Corporation | Radial piston fuel supply pump |
US8007251B2 (en) | 2004-05-28 | 2011-08-30 | Stanadyne Corporation | Radial piston fuel supply pump |
Also Published As
Publication number | Publication date |
---|---|
ATE170597T1 (de) | 1998-09-15 |
FI950595A0 (fi) | 1995-02-10 |
DE69412910D1 (de) | 1998-10-08 |
KR950703123A (ko) | 1995-08-23 |
DE69412910T2 (de) | 1999-01-21 |
EP0628721B1 (de) | 1998-09-02 |
NL9301010A (nl) | 1995-01-02 |
FI950595A (fi) | 1995-02-10 |
WO1994029592A1 (en) | 1994-12-22 |
JPH08500172A (ja) | 1996-01-09 |
US5647729A (en) | 1997-07-15 |
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